基于STM32的超多路阵列信号采集技术的设计与实现  

Design and Implementation of Multi-channel Array Signal Acquisition Technology Based on STM32

作　　者：刘意 王午鑫 马凯 

机构地区：[1]天津工业大学工程教学实习训练中心,天津300300 [2]天津工业大学电子与信息工程学院,天津300300

出　　处：《仪器仪表用户》2018年第4期11-14,共4页Instrumentation

摘　　要：在检测边坡沉降的激光位移传感器设计中,采用线性阵列光敏电阻来感应激光光斑的照射位置,低复杂度、高精确度地获取128路阵列光敏元件的实时阻值成为关键。本文提出一种基于STM32和共集电极电路的阵列信号采集技术,利用高速晶体管将阵列光敏元件分为8组,并联在ADC的16路采集通道上,使用分组串行采集和软件补偿算法获得128路阵列光敏元件的准确阻值。通过理论分析、实验验证,该方法可以准确地采集128路阵列信号,确定激光光斑位置,大幅度降低了阵列光敏电阻信号采集的复杂度和成本。In the design of laser displacement sensor, linear array of photosensitive resistance was used to detect the laser ir-radiation position. How to get the real-time resistance of the 128 array photosensitive resistance with low complexity and high accuracy was the key. This paper proposes a kind of array signal acquisition technology based on STM32 and common-collector circuit, in which the photosensitive elements were divided into 8 groups by high speed transistor, and they were in parallel with the 16 channels of ADC. The system used packet serial acquisition and software compensation method to obtain the accurate resistance of 128 array photosensitive element. Through theoretical analysis and experimental verification, this method can accurately acquire 128 array signals, then determine the location of laser spot. It substantially reduces the complexity and cost of acquisition of array photosensitive resistance signal.

关 键 词：阵列信号采集 光敏元件 共集电极电路 激光光斑位置 STM32 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]